filename="fs_mini_common_cf4062113b7e21d3.yaffs2"
file_size=$(du --bytes $filename | cut -f1)
echo "way1: $file_size"

file_size=$(stat -c%s $filename)
echo "way2: $file_size"

file_size=$(du -sh $filename | cut -f 1)
echo "way3: $file_size"